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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 /*
      6  * Copyright (C) 2010 Apple Inc. All rights reserved.
      7  *
      8  * Redistribution and use in source and binary forms, with or without
      9  * modification, are permitted provided that the following conditions
     10  * are met:
     11  * 1. Redistributions of source code must retain the above copyright
     12  *    notice, this list of conditions and the following disclaimer.
     13  * 2. Redistributions in binary form must reproduce the above copyright
     14  *    notice, this list of conditions and the following disclaimer in the
     15  *    documentation and/or other materials provided with the distribution.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
     18  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
     19  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
     21  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     22  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     23  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     24  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     25  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     26  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
     27  * THE POSSIBILITY OF SUCH DAMAGE.
     28  */
     29 
     30 #include "PluginTest.h"
     31 
     32 #include "PluginObject.h"
     33 
     34 using namespace std;
     35 
     36 // Passing null for our NPP_GetValue function pointer should not crash.
     37 
     38 class NullNPPGetValuePointer : public PluginTest {
     39 public:
     40     NullNPPGetValuePointer(NPP, const string& identifier);
     41 
     42 private:
     43     virtual NPError NPP_Destroy(NPSavedData**) OVERRIDE;
     44     virtual NPError NPP_GetValue(NPPVariable, void* value) OVERRIDE;
     45 
     46     NPP_GetValueProcPtr m_originalNPPGetValuePointer;
     47 };
     48 
     49 static PluginTest::Register<NullNPPGetValuePointer> registrar("null-npp-getvalue-pointer");
     50 
     51 NullNPPGetValuePointer::NullNPPGetValuePointer(NPP npp, const string& identifier)
     52     : PluginTest(npp, identifier)
     53     , m_originalNPPGetValuePointer(pluginFunctions->getvalue)
     54 {
     55     // Be sneaky and null out the getvalue pointer the browser is holding. This simulates a plugin
     56     // that doesn't implement NPP_GetValue (like Shockwave Director 10.3 on Windows). Note that if
     57     // WebKit copies the NPPluginFuncs struct this technique will have no effect and WebKit will
     58     // call into our NPP_GetValue implementation.
     59     pluginFunctions->getvalue = 0;
     60 }
     61 
     62 NPError NullNPPGetValuePointer::NPP_Destroy(NPSavedData**)
     63 {
     64     // Set the NPP_GetValue pointer back the way it was before we mucked with it so we don't mess
     65     // up future uses of the plugin module.
     66     pluginFunctions->getvalue = m_originalNPPGetValuePointer;
     67     return NPERR_NO_ERROR;
     68 }
     69 
     70 NPError NullNPPGetValuePointer::NPP_GetValue(NPPVariable, void*)
     71 {
     72     pluginLog(m_npp, "NPP_GetValue was called but should not have been. Maybe WebKit copied the NPPluginFuncs struct, which would invalidate this test.");
     73     return NPERR_GENERIC_ERROR;
     74 }
     75